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1. Contraction of had: He'd already left.
2. Contraction of would: I'd rather walk than drive.
3. Contraction of did: Who'd you ask?
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
would or had: I'd; you'd.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
n., pl. Ds D's, ds d's.
1. the fourth letter of the English alphabet, a consonant.
2. any spoken sound represented by this letter.
3. something shaped like a D.
4. a written or printed representation of the letter D or d.d
(of a molecule) having a configuration resembling the dextrorotatory isomer of glyceraldehyde: printed as a small capital, roman character (disting. from l-).
dextrorotatory; dextro- (disting. from l-).
do (esp. before you): How d'you like them?
1. contraction of had: They'd already left.
2. contraction of would: I'd like to see it.
3. contraction of did: Where'd you go?
4. contraction of - ed: She OK'd the plan.
1. the fourth in order or in a series.
2. (sometimes l.c.) (in some grading systems) a grade or mark indicating poor or barely acceptable quality.
a. the second note of the ascending C major scale.
b. a tonality having D as the tonic.
4. (sometimes l.c.) the Roman numeral for 500. Compare Roman numerals.
5. Physics. density.
8. Brit. pence.
[< Latin denāriī]
9. Chiefly Brit. penny.
[< Latin denārius]
10. Physics. density.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.